Living in housing projects among black and Puerto Rican neighbors inspired her interest in the civil rights movement. Kochiyama held weekly open houses for activists in the family's apartment, where she taped newspaper clippings to the walls and kept piles of leaflets on the kitchen table. "Our house felt like it was the movement 24/7," said her eldest daughter Audee Kochiyama-Holman.

Kochiyama is also known for rushing towards Malcom X after his assination, where she appeared images of the incident, according to NPR:

Minutes after gunmen fired at Malcolm X in 1965 during his last speech in New York City, she rushed towards him and cradled his head on her lap. A black-and-white photo in Life magazine shows Kochiyama peering worriedly through horn-rimmed glasses at Malcolm X's bullet-riddled body.